Poor overachieving, gifted boys let down by society or shunned by family… /sarcasm/
Seriously, though (not really), one gotta give Gang Ok respect for his thorough mental hygiene methods… breathing deeply, shuffling motivational cards, boxing, stalking Ji Yong, playing mind games with Mi Ryeo, pounding unrepentant criminals to death… no wonder his father is still alive. Not for long, though, given the face Gang Ok made in this chapter.
Also, I can swear that the office Ji Yong raided in this chapter is in the same building as the one Mr Bang did in the previous chapter… maybe it's a building that only rents offices to racket operations?